Environmental News Network: A new study suggests that human have been producing traceable amounts of atmospheric methane earlier than thought. The results will challenge global warming predictions, because what was assumed to be 'natural' levels of methane, have in fact been inflated by human activities since Roman times. An international team of researchers looked at carbon isotopes in methane trapped in air bubbles from Arctic ice cores, to reveal the different levels and concentrations of methane. "With our research,...
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